My children were invited to one of these parties and to be honest, I wasn't that impressed. We went to the birthday girl's home and the kids all sat at the table. They were given their animals to stuff, similar to Build-a-Bear. They put in a heart and then velcro-ed the backs closed. When they were done, the woman doing the presentation packed up and left. That was it! The birthday child's mom ended up doing games and cake on her own. The whole Noah's Workshop part took maybe 20 minutes! You would definitely need to plan other activities to keep the kids occupied. Also, my DD has asthma and she started wheezing after playing with the animal. I pulled out all the fiber-fill and washed the animal in the washing machine, then I re-filled it with new fiber-fill. I don't know where the stuff was stored before it was given to DD, but it may have been in a basement or garage because it smelled a little musty.
I wouldn't call Noah's Workshop a "party", it was more of an "activity". It did make for a nice party favor, but I think you can probably buy those build-a-bear kits cheaper and do them on your own.
This set is $14.99, but it comes with an outfit. I think that price is in the same range as the Noah's Workshop.
http://www.amazon.com/Colorbok-Buil...e=UTF8&s=toys-and-games&qid=1263313674&sr=1-2
This one is a monkey and they also have a pirate puppy.
http://www.amazon.com/Colorbok-Buil...e=UTF8&s=toys-and-games&qid=1263314271&sr=1-3
Good Luck with your decision!